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Questions tagged [nfc]

Near Field Communications - In antennae theory Far Field radiation is that RF energy that gets transmitted, Near Field is the RF energy that typically does not propagate , unless it is intercepted by a special antenna. It is used to transmit signals over short distances without transmitting widely, it is used in wireless communications for very short ranges on the order of meters and is harder to intercept because you have to be close.

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38 views

Why I could not change this eagle NFC class6 antenna footprint?

I am designing a NFC board prototype that uses NT3H1101 chip. For this, I use NXP AN11276 antenna design guide. This document contains sample file download links for class 6 antennas. I downloaded ...
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Large NFC/RFID reader antenna around a screen

I would like to have an NFC/RFID reader with a screen around 7", where one could tap the card anywhere on the screen to have it detected/read. I do not need to know where the card was placed (...
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PN532 (SPI) how to get firmware version

I am trying to use PN532 for Mifare card reading on STM32F4. Before even trying to go forward I have tried to read firmware version to verify that all works ok and cannot do it. I am trying to base ...
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Screen with built-in NFC

So I've started working on a small project (small at the moment) and I'm seeing some issues in my prototype plans, and I need your help with this. Short answer: I need a led touchscreen with NFC ...
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56 views

My cellphone is acting as an RFID tag? [closed]

I bought a cheap keyboard emulating RFID (miFare) reader for my PC. I just noticed that the reader can 'read' my cell phone (Pixel 1 XL). Every read seems to return a different serial number. I can ...
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21 views

Passive RFID design assistance

I am looking for the correct RFID tag/reader system for my design. The general block diagram of the system is above. The requirements for the system are as follows: Passive tags of some form and an ...
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68 views

Tracking the location of NFC chips on a board

For a oroject, I am looking to track the location of several game pieces on a game board using NFC chips. This board is made up of a grid and would need to send the location back to a device. I was ...
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25 views

Scalable NFC antenna surface for multiple object detection

as I am absolutely new to NFC and electrical engineering in general (my background is software engineering), I will probably upset users on this Stack with my lack of previous research. But the idea I ...
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32 views

Read T5577 tags with PN532 reader

I am working with adafruit RFID/NFC reader. This reader works with a PN532 chip. This chip is designed to read mifare tags (13.56MHz). I want to read T5577 tags. This tags works at 125 kHz. I am ...
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105 views

Advice on battery powered ESP32 with NFC Design

I'm new to PCB design (First one) and I want some advice and tips from more knowledgeable people in regard to basic design elements and especially the power consumption part. I want to make the ...
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104 views

NFC antenna connection to ground midway through loop

I'm designing a PCB etched NFC antenna. I'm confused about a design element I've seen in several production boards. I haven't seen this element explicitly discussed in any app notes or design guides. ...
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Is there a difference between an NFC and RFID chip?

The other day, my friend said that he wants to write an app that uses the NFC chip on a phone to read pet microchips. I told him I was pretty sure that pet microchips don't use NFC, but he said he was ...
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74 views

NTAG213 Not being picked up by the RC522 Module

I have been using the RC522 module to read and write things to the tags it came with. But when I tried to use an NTAG213 I bought for a recent project it will act as if it isn't there. I've tried a ...
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336 views

External Antenna connection on MFRC522

New to RFID world. I am working on a Healthcare product. One of the feature includes authentication of patients which will be done through RFID reader MFRC522. Application schematic in the datasheet ...
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63 views

can aluminum foils increase the boost the range of nfc reader?

I have been working on a project where I have to read data from an NFC tag and store the information locally. Currently I have a range for the NFC tag of about 5 cm. The tags will be present inside a ...
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IC on Digikey is 5x more expensive than board containing same IC on Alibaba: How? [closed]

I built a prototype using an NFC board I bought from Alibaba for 1$ (https://www.alibaba.com/showroom/rfid-rc522.html). It claims to use the NXP MFRC522 IC, and if I look on the board the chip has ...
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how to enlarge the reading range between the 13.56MHz NFC reader and tags with ISO15693?

I use TI devices, DLP7970ABP and RF430FRL152H tag. In order to enlarge the reading range, I buy a power amplifier and a large antenna(430mm*330mm). If I only disconnect the original antenna on the ...
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What is the difference between ISO/IEC standards and NFC Forum Type specifications?

As far as I understand, NFC Forum Type specifications are based on existing ISO/IEC standards so there is no theoretical difference there. NFC Forum Type specifications however go one step further and ...
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My antenna tuning component values worked on a fresh board previously. Now they're not working. What could be causing this?

This is one of those hardware questions that's making me bang my head against a wall. About six weeks ago I spent a day tuning the NFC antenna on my board. I ended up using ~71pF of shunt capacitance ...
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NFC Antenna Feed Lines

I've designed a number of boards in the past that use NFC but I don't think the RF performance has ever been exceptional. These boards have an NFC chip (generally the STM M24SR64-YMN6T/2) connected to ...
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S11 parameter measurements of NFC PCB antenna by VNA

I'm trying to measure the S11 parameter of the NFC PCB antenna (actually PCB coil) by VNA. Desired Smith chart pattern is like the below picture (probably with different values, because of different ...
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41 views

Writing data into a SPI Flash using NFC?

I have a 16 Mbit SPI flash. I want to write data to the SPI flash using NFC. I know there are multiple NFC+MCU series out there that can do this. However, the NFC+MCU require JTAG, LDOs, ..etc. The ...
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64 views

Android NFC library - Command not recognized

To access more than 2kb of data from TI Rf430 transponder IC, a custom command (0xC0) in specific format needs to be sent. On sending the custom command, command not recognized (0x01) is the response ...
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96 views

Reading NFC tag from a slightly longer distance

Presently, my problem is that I have this NFC/RFID Tag, and due to the small antenna on the tag, it needs to make direct contact with the reader (presently tested using both a smartphone w/ NFC ...
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77 views

How can I make my RFID reader restrict itself to the tag in the closest proximity and read only this tag?

I'm looking for a way to detect the user closest to a certain object that has the RFID reader attached to it. Therefore I need my RFID reader to restrict itself to the user closest to it and not read ...
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NFC spectrum analysis, weird frequencies showing

I apologize for the picture quality, I did not have an opportunity to export the screenshots. I have a problem properly interpreting this signal. The subcarrier peak is visible but the data seems to ...
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137 views

NFC/RFID device sending URL to NFC-enabled smartphone at 20-30cm

I am very new to this so please bear with me. I have read many questions but I haven't quite found a suitable one for what I would like to do. I would need a NFC/HF RFID device able to send an URL to ...
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What is this weird EMV pin on my credit card?

I recently got a Venmo card, which is my first card with contactless support. I was looking at the EMV pins and noticed a very weird design. In the middle of the ground pin there is this long, thin ...
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691 views

Can you find what RFID frequency is used in a tag and then edit it? [closed]

A short background: my brother has membership at a gym that uses small RFID tags ("near field", I suppose, as you need to tap them against the spinning gate in order to open it) and after changing his ...
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is it true that whether a POS can read an NFC card, that POS is compatible with HCE?

I was wondering if the host card emulation would produce the same result as an physical contactless card is producing.
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314 views

Repairing an RFID antenna? [closed]

I have an RFID antenna that seems to be on a custom PCB. The issue I have is that the antenna on one side works fine, but the other side does not. I'm not sure if it is even possible or worthwhile to ...
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125 views

Near-field-communication / NFC at no cost

My company is developing and producing measurement devices. To quality check and adjust the full devices automatically, we need to be able to read the display indication and trigger functions like ...
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59 views

NFC Antenna matching

I am trying to follow the TI document on NFC antenna matching for the TFR7970A chipset. http://www.ti.com/lit/an/sloa241b/sloa241b.pdf I am under linux, and while I could try wine to use the smith ...
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144 views

Sensing a tag passes through a virtual “fence”

We have two cats who like to hide in our house. It would be great to know where they are in the house. At first I thought about setting up an indoor localization system (iBeacon, etc.) in place, but ...
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On board 13.56MHz RFID antenna design

I recently stumbled upon a two-in-one NFC key designed by N-O-D-E and was astonished. Although its original purpose is for security, I love the idea of using tact ...
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1k views

What is the typical power that is transmitted through NFC from a smartphone

I think the question is clear. I only need a reference value, like is it in the range of 1mW or 10mW or 100mW. Clearly this will vary among smartphones. Also do you think it is possible to set the ...
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28 views

Need help with nfc on phone [closed]

I’m looking for a quick and easy way to extend the range on my Samsung s4 I’m currently using a iPhone 5 but I use a my old Samsung s4 for my music and I have these nfc connect speakers and was ...
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71 views

How is a NFC “connected tag” different from a full blown NFC reader?

I have played with NFC in the past, but those were full blown "NFC readers" based on NXP pn53x chips. I want to know, how is a so called "Connected tag" different from NFC readers? I found this chip ...
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What factors affect the read distance of NFC chips, and how?

I'm trying to understand how to improve the reading distance of an NFC system. So far, my understanding is that there are a few main factors in the read distance: Size/shape of the antenna on the NFC ...
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“Antenna matching networks for dummies”?

I'm working on a project where I'm building a custom NFC antenna that will be connected to a PN532 NFC controller. The antenna has already been designed (for 13.56 MHz) and built, the PN532 is also ...
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What prevents (illegitimate) operation of NFC with higher power?

I was going to post this on Information Security, but Elecrical Engineering may possibly be a better fit since it's more about the technical side. Like most people nowadays, I am left with no choice ...
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71 views

PN53x with emulate nfc

I saw that many of nfc reader/emulate based on PN53x chipset of NXP. But the disadvantage of this chipset is , you can't emulate ISO14443-B why is PN53x chipset ...
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How to read NFC tags Simultaneously?

I look for a solution for a problem in my project. The idea of the project is to create a smart library which help us to know where every book located in every period of time. Picture : The idea ...
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636 views

Is possible to update the firmware of the PN532 chip?

I want to know if is possible to update the firmware of the NFC chip PN532 from NXP. If it is, how can this be done? If this isn't the appropriate Stack exchange site please move the question.
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3k views

RFID solution for reading multiple tags

I am working on a Robot-project where a sub task is have to check how many and which RFID-tags are placed in a bucket. Multiple tags will be placed into the bucket - so I run into the problem with ...
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133 views

Blocking NFC-Tags without metal

I got this NFC-Tag and I try to do something, so that this tag can't be recognized by any nfc-tag-reader anymore. But I want to easily change this state, so that I can easily 'free' the nfc-tag so ...
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Is the ability of reading NFC-tags in smartphones specified?

Is the NFC-reading-module in smart phones in a way specified (e.g. in ISO 18092) as that every smart phone has the same 'power' of reading NFC-tags. I am not an electrical engineer. What I am trying ...
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318 views

Does this rfid reader work with the nfc ring? [closed]

I bought a rfid rc522 and hooked it up with an arduino nano. The rc522 reader says it reads at a frequency of 13.56Mhz. The nfc ring is also at 13.56MHz but i can not get it working with it. The ...
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547 views

Function of solid plane in the NFC antenna

Below picture shows 2 NFC antenna designed by NXP for their NFC chips . As you can see there are square planes in the middle of antenna,these planes have no Nets(does not connected to any where ). ...
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I need a cheap solution for wireless connection in a parking [closed]

I want to build a parking system "besides some busy streets" that when a car parks in the specified locations, the system charges something like a card that it's exist on the car or something like an ...